| 摘要 |
A voltage source converter (30), for interconnecting first and second electrical networks (44, 46), comprising: first and second terminals (32, 34) for connection to the first electrical network (44); and a primary converter limb (36a) extending between the first and second terminals (32, 34), the primary converter limb (36a) including first and second primary limb portions (38, 40) separated by a third terminal (42), the third terminal (42) being connectable to the second electrical network (46), each primary limb portion (38, 40) including at least one switching element (50) and/or a first chain-link converter, each primary limb portion (38, 40) being operable to be switched into and out of circuit between the third terminal (42) and a respective one of the first and second terminals (32, 34), each primary limb portion (38, 40) being operable to transfer power between the third terminal (42) and a respective one of the first and second terminals (32, 34); at least one second chain-link converter (58) connected to the third terminal (42), the or each chain-link converter (58) comprising a plurality of chain-link modules (60), each of the plurality of chain-link modules (60) being operable to selectively provide a voltage source, wherein the or each chain-link converter (58) includes a control unit configured to selectively operate the plurality of chain-link modules (60) to generate a discontinuous pulse width modulation voltage waveform; and a controller (62) configured to selectively operate the or each chain-link converter (58) to control the configuration of a discontinuous pulse width modulation voltage waveform at the third terminal (42), the controller (62) including the or each control unit, the controller (62) being configured to selectively control switching of each primary limb portion (38, 40) into circuit between the third terminal (42) and a respective one of the first and second terminals (32, 34) during a respective unmodulated period of the discontinuous pulse width modulation voltage waveform, the controller (62) being configured to selectively coordinate operation of the primary limb portions (38, 40) and the or each second chain-link converter (58) to control the configuration of the discontinuous pulse width modulation voltage waveform at the third terminal (42). |
